.content {
    height: 100%;
    overflow-y: auto;
    position: relative;
}
.canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}
.item {
    display: inline-block;
    margin: 1em;
    padding: 1em;
    box-shadow: 1px 2px 4px rgba(0, 0, 0, 0.25);
}
.item > div:nth-child(1) {
    width: 200px;
    height: 200px;
}
.item > div:nth-child(1):focus {
    outline: auto;
}
.item > div:nth-child(2) {
    color: #888;
    font-size: large;
    margin-top: 0.5em;
}
.hide {
    display: none;
}
